[crypto] implement prekey rotation in OlmAPI

Summary:
Shared code with prekeys rotation.

Web part should match native C++ version implemented here.

This code could be vulnerable to multiple promises modyfing olm account but fixing this is tracked in ENG-6768.

For now matching code implemented in native - but we should mark prekeys as published before uploading as described and tracked here. (cc. @varun)

Depends on D11120

Test Plan: Modify shouldRotatePrekey method to return true and check if it works.

Reviewers: marcin, varun, tomek

Reviewed By: tomek

Subscribers: ashoat, varun

Differential Revision: https://phab.comm.dev/D11154